Weird Stretchy Mesh Problem

Hello everyone. I have encountered a problem with a model I just rigged. The model looks fine when it is in the 3D view, but when I Press ā€œPā€ to start the game engine, part of the mesh stretches out. I have attached a screenshot of the problem and the .blend file. Thanks to anyone who can help.:slight_smile:

Attachments

Zombie Animation Problem.blend (781 KB)